I want to know more about ore deposits in igneous rocks..
Dear Gholamreza: tholeiitic magma usually forms two kinds of stratiform gabbroic ígneous complexes: 1) Lopolith type, like Bushweld, Stillwater, Muskox, and others, and 2) The plutonic part of the ocean crust, generated in deep parts of the oceanic ridges, and which conforms some 1,5-2 km of the oc. crust. In both environments, magmatic segregation deposits of cumulate chromite occur, often associated with PGE, in (1) as strictly stratiform bodies of great length and small widht, or stratiform chromitites, or in (2) as the so called podiform chromitites of somewhat lenticular form. Also in (1) are possible deposits of Ni-Cu-PGE formed by liquid inmiscibility of sulfides, and also some Ti-magnetite stratiform ores. Due to the low volatile content of basaltic magma, strictly hydrothermal deposits don't form, but in the sea floor basaltic lavas, due to deep circulation of marine waters, there form massive volcanogenic sulfides or MVS, typically found in pillow lavas, such as in Cyprus, Semail, etc., whose fluid discharge on the sea floor is now known as the "black smokers". Regards, Sebastián.
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